How do I reset my Audi A7 navigation system?

I recently experienced a problem with my Audi A7's navigation system. The screen is frozen on the map and I am unable to change the destination or even access the menu. How can I reset the navigation system?

First, try pressing and holding the power button for 10 seconds to see if the system will reboot. If this does not work, try removing the car's key from the ignition and waiting a few minutes before restarting the car. You can also try disconnecting the car battery for a few minutes and then reconnecting it. If none of these solutions work, you may need to take your car to an Audi dealership or certified mechanic for further assistance.

I had a similar issue with my Audi A7's navigation system and found that resetting the MMI (Multi Media Interface) system solved the problem. To do this, press and hold the Volume Down and Menu buttons simultaneously for a few seconds until the screen goes dark. Then, release the buttons and wait for the system to reboot. If this does not work, try resetting the system using the MMI button located on the central control knob.